RAID 10 using two disk: Software RAID 0 on top of hardware RAID 10

Posted on 2005-05-13
Last Modified: 2010-04-03
Are there any issues with software striping (RAID 0) across two hardware mirrors (RAID 1)?  I as I currently have two SATA 160GB drives and am thinking to create two hardware mirror volumes of the same size (HWRAID1_VOL0, HWRAID1_VOL1).  Then on the software side converting each of the VOLUMES (seen as drives by windows) to dynamic and creating a single striped volume.
Question by:vascent
    LVL 30

    Accepted Solution

    Good performance, good redundancy. What more can you ask for? :-)

    Ideally haedware RAID 10 will give the best performance as a sophisticated RAID controller can direct I/O to the least busy drive - but a s/w RAID 0 volume striped across mirrors is a good compromise.

    My only other comment is that: don't be lulled into not taking regular backups. RAID volumes can still fail.


    Expert Comment

    As meyersd said, "What more can you ask for?"
    Sounds good mate.
    I see no reason why it wouldn't work.
    You'll have the redundancy you need, with above-normal speed.
    Let us know how you get on.
    Just backup regularly mate.
    Ghosting will work fine, just ghost as a whole drive.
    LVL 2

    Expert Comment

    If you use hardware raid 1 to mirror the drives, how is windows seeing two volumes? Doesn't make sense to me. I use hardware raid 5 all the time, and windows only sees one volume.

    Also, my limited understanding of raid 10 is the following...(feel free to correct me)
        First -a bank of drives (min 3) config'd as RAID 5 Volume (seen as one by windows)
        Second - another bank of drives (min 3) config'd as RAID 5 Volume (seen as one by windows)

    Then, using either very advance SAN management, or, fooling it by taking those two volumes in windows and configuring them to mirror each other.

    Basically, two raid 5 volumes configured to mirror each other = RAID 10

    Two drives mirroring each other through hardware, then, somehow running striping across the same two drives with software DOES NOT equal RAID 10.

    Am I wrong? If not, then what you wrote in your original question should not work...

    Willing to learn, and, only trying to help. -dalberson
    LVL 30

    Expert Comment

    by:Duncan Meyers
    >Basically, two raid 5 volumes configured to mirror each other = RAID 10

    Errrrr, no. That would be RAID 15.

    RAID 10 is a RAID 0 (striped, no parity) striped across mirrored sets. The RAID 0 component gives good erformance whilst the mirrors provide good redundancy. Note that RAID 0/1 is not the same as RAID 10. RAID 0/1 takes a RAID 0 set and mirrors it. If you lose on disc then you lose one entire stripe set and you are now vulnerable - if you lose one more disc thenm you're history. I know that it sounds like splitting hairs, but that's the way it works.
    LVL 87

    Expert Comment


    No comment has been added to this question in more than 21 days, so it is now classified as abandoned..
    I will leave the following recommendation for this question in the Cleanup topic area:
    Accept: meyersd

    Any objections should be posted here in the next 4 days. After that time, the question will be closed.

    EE Cleanup Volunteer

    Featured Post

    New My Cloud Pro Series - organize everything!

    With space to keep virtually everything, the My Cloud Pro Series offers your team the network storage to edit, save and share production files from anywhere with an internet connection. Compatible with both Mac and PC, you're able to protect your content regardless of OS.

    Join & Write a Comment

    Problem description :  Some external hard disks / USB flash drives do not show actual space as mentioned in the factory settings. This is a common problem when you use an 8 GB USB drive to make it bootable to install a firmware/ driver on a serv…
    The article will include the best Data Recovery Tools along with their Features, Capabilities, and their Download Links. Hope you’ll enjoy it and will choose the one as required by you.
    This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
    This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…

    754 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    20 Experts available now in Live!

    Get 1:1 Help Now